#include <stdio.h>
#define CA(s) int pid##s = (int)#s;
int main()
{
    const char* s = "usr";
    printf("0x%x\n", (unsigned int)s);
    int pidusr1 = (int)"usr";
    printf("0x%x\n", (unsigned int)pidusr1);
    CA(usr)
    printf("0x%x\n", (unsigned int)pidusr);
    return 0;
}
